If you are a system administrator or developer who has already used Puppet and are looking for mastery-level skills and best practices with a view to using Puppet in an enterprise environment, at large scale, this book is for you. Some beginner-level knowledge of using Puppet would be necessary.
If you are looking for a gentle introduction to Puppet, before starting to use this book, please take a look at Puppet's own free self-paced training courses (https://learn.puppet.com/category/self-paced-training) or attend some instructor-led or private training (https://puppet.com/support-services/training).